EP3132884B1 - Verbundener körper aus ungleichen metallen - Google Patents

Verbundener körper aus ungleichen metallen Download PDF

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Publication number
EP3132884B1
EP3132884B1 EP15780338.8A EP15780338A EP3132884B1 EP 3132884 B1 EP3132884 B1 EP 3132884B1 EP 15780338 A EP15780338 A EP 15780338A EP 3132884 B1 EP3132884 B1 EP 3132884B1
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EP
European Patent Office
Prior art keywords
joined body
plate
made out
copper material
molten mixed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP15780338.8A
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English (en)
French (fr)
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EP3132884A1 (de
EP3132884A4 (de
Inventor
Daisuke SHIOGA
Tomomi Tanaka
Koji Funami
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Intellectual Property Management Co Ltd
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Panasonic Intellectual Property Management Co Ltd
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Publication of EP3132884A1 publication Critical patent/EP3132884A1/de
Publication of EP3132884A4 publication Critical patent/EP3132884A4/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/32—Bonding taking account of the properties of the material involved
    • B23K26/323—Bonding taking account of the properties of the material involved involving parts made of dissimilar metallic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/0006—Working by laser beam, e.g. welding, cutting or boring taking account of the properties of the material involved
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/21—Bonding by welding
    • B23K26/24—Seam welding
    • B23K26/244—Overlap seam welding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/521—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the material
    • H01M50/522—Inorganic material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/08—Non-ferrous metals or alloys
    • B23K2103/10—Aluminium or alloys thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/08—Non-ferrous metals or alloys
    • B23K2103/12—Copper or alloys thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/18—Dissimilar materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present invention relates to a dissimilar metal joined body formed by joining a copper-based material (hereinafter, a copper material) and an aluminum-based material (hereinafter, an aluminum material) by laser welding.
  • a copper-based material hereinafter, a copper material
  • an aluminum-based material hereinafter, an aluminum material
  • a hard and brittle intermetallic compound is formed in a molten portion in the laser welding between dissimilar metals. Accordingly, the joint strength is largely reduced as compared with a case of welding between same kinds of metals and brittle fracture behavior is shown.
  • a joined body having the following structure is known.
  • the joined body is fabricated in the following manner.
  • a clad material including a first metal member and a second metal member is arranged between a first metal and a second metal which are materials to be welded and have different melting points so that the same kind of metals contact each other.
  • the first metal, the clad material and the second metal are integrated by laser welding from both surfaces of the first metal and the second metal in a welding condition in which dissimilar metals do not melt each other (for example, refer to Patent Literature 1).
  • the joined body is fabricated in the following manner.
  • a first metal plate and a second metal plate having different melting points are partially overlapped.
  • the overlapped portions are irradiated with laser discontinuously, thereby forming spot-like welding portions continuously (for example, refer to Patent Literature 2) .
  • the present disclosure provides a dissimilar metal joined body of a copper material and an aluminum material in which the joint strength is increased to a base material strength.
  • a dissimilar metal joined body according to the present invention is composed of a copper material, an aluminum material and a molten mixed portion.
  • the molten mixed portion is configured so that part of the aluminum material is melted and flows into the copper material.
  • a depth from a surface of the copper material which contacts the aluminum material in the molten mixed portion is at least 5 ⁇ m and no greater than 30 ⁇ m.
  • Patent Literature 1 when the joined body in Patent Literature 1 is applied to a joint of a plate material (bus bar) connecting between cell electrodes in an in-vehicle battery module, the volume or mass is increased as a whole as the clad material is interposed between the bus bar and the cell electrode. Accordingly, the energy density as an important performance of the battery module is reduced. Furthermore, it is necessary to consider variations in thickness of the clad material in the laser welding in which the highly-precise positioning is necessary in the optical axis direction, which complicates production process.
  • a cell main body is arranged just below a contact part of the bus bar and the cell electrode to be joined. Therefore, the cell main body blocks the access of the laser beam to reverse faces of the bus bar and the cell electrode. Therefore, it is difficult to emit the laser beam from the reverse faces of the bus bar and the cell electrode.
  • the joined body in the Patent Literature 2 is characterized by suppressing alloying which causes increase of an electric resistance value by forming the spot-like welding portions by pulse waves rather than forming a linear welding portion by continuous irradiation of the laser beam. Therefore, the joint area is inevitably reduced and it is difficult to improve the joint strength to the base material strength.
  • Fig. 1 is a view schematically showing a cross section of a joined portion according to the embodiment of the present invention.
  • An aluminum material 101 and a copper material 102 which are members to be joined are partially overlapped to thereby form an overlapping area 103 and welded by irradiating an arbitrary position in the overlapping area 103 with a laser beam 104.
  • the laser beam 104 is emitted continuously from a surface of the aluminum material 101 having a relatively low melting point, which is the opposite side of a surface contacting the copper material 102, thereby forming a linear welding portion. Accordingly, a molten mixed portion 105 which is continuous in a scanning direction as well as having a width W and a depth "t" of a certain specific range is formed.
  • the width W indicates the shortest dimension of the molten mixed portion 105 on a surface of the copper material 102 which contacts the aluminum material 101.
  • the aluminum material 101 irradiated with the laser beam is melted completely to the surface contacting the copper material 102 at the moment when the laser beam 104 is emitted. Therefore, a molten portion 110 connecting to the molten mixed portion 105 is formed in the surface of the aluminum material 101, which is opposite to the surface contacting the copper material 102.
  • the molten mixed portion 105 is formed so that the aluminum is melted and flows into the copper material 102 from the surface of the aluminum material 101 which contacts the copper material 102.
  • the surface contacting the copper material 102 indicates the reverse surface of the aluminum material 101, which is opposite to the surface irradiated with the laser light 104.
  • Various parameters such as the output, scanning speed and the energy density of the laser beam 104 are optimized so that the molten mixed portion 105 is formed. Then, the shape dimension of the molten mixed portion 105 determines the joint strength of the joined body.
  • Fig. 2 shows the relation of the peel strength of the joint of the joined body, the width W and the depth "t" of the molten mixed portion 105 with respect to the input energy value when performing welding by using a fiber laser having higher light condensing performance in a range in which the laser output is 500 to 1100 W and the scanning speed is 240 to 720 mm/s.
  • the necessary input energy value is changed according to the thickness of the aluminum material 101 irradiated with the laser beam 104. Therefore, the optimum value depending on the thickness of the aluminum material 101 exists in the input energy values in which the high joint strength can be obtained.
  • Fig. 2 shows results obtained when the thickness of the aluminum material 101 is 0.6 mm as an example.
  • the peel strength is 320 to 400 N when the input energy value is approximately 2.3 J/mm, and the base material is fractured when peeled. Accordingly, it is found that the joint strength of the joined portion has been improved to the base material strength level.
  • the peel strength is the same level as the same metal joined body of aluminum materials. It has been checked that the same tendency is shown when the thickness of the copper material 102 is at least 1 mm and/or when the thickness of the aluminum material 101 is at least 0.5 mm and no greater than 0.8 mm.
  • the depth "t" of the molten mixed portion 105 in which the high joint strength as described above can be obtained is limited to a certain specific range, specifically the range of at least 5 ⁇ m and no greater than 30 ⁇ m.
  • the width W is limited to a range of at least 10 ⁇ m and no greater than 50 ⁇ m.
  • the optimum range of the above width W is 20% to 30% of the case where the same materials are joined. Accordingly, the width W of the molten mixed portion 105, namely, the welding width can be narrowed.
  • the input energy amount is extremely reduced as compared with the case where the same materials are welded as described above, thereby forming the molten mixed portion 105 as the welded portion to be thinner and shallower. Accordingly, the number of welding lines can be multiplied to three or four times. In this case, the joint strength can be further improved while maintaining the ductility performance.
  • the concentration of a copper component inside of the molten mixed portion 105 is suppressed to be lower than 10%.
  • concentration of an aluminum component in a region near the molten mixed portion 105 in the copper material 102 is also suppressed to be lower than 10%.
  • the deposition of the intermetallic compound is suppressed to a small amount as described above. It can be considered that brittle fracture behavior does not occur and a ductility fracture mode is obtained as the deposition of the intermetallic compound is suppressed to a small amount (plastic deformation of the base material appears) .
  • the surface of the copper material 102 is covered with Ni plating. Specifically, it has been checked that the copper material 102 covered with Ni plating is partially overlapped with the aluminum material 101 and irradiated and welded with the laser beam 104 as described above to thereby form a stronger joint.
  • the dissimilar metal joined body according to the invention is composed of the copper material 102, the aluminum material 101 and the molten mixed portion 105.
  • the molten mixed portion 105 is configured so that part of the aluminum material 101 is melted and flows into the copper material 102.
  • the depth from the surface of the copper material 102 contacting the aluminum material 101 in the molten mixed portion 105 is at least 5 ⁇ m and no greater than 30 ⁇ m. According to the configuration, it is possible to increase the joint strength to the level in which fracture occurs in the base material part of the aluminum material 101 which has relatively low mechanical strength.
  • the dissimilar metal joined body according to the present invention can be applied to the connection between the bus bar connecting between terminals of a battery and an individual electrode terminal.
  • an expensive clad-material bus bar formed of the copper material and the aluminum material is used for connecting between electrode terminals, and the structure formed of only the joined body of the same kind of materials is adopted.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Laser Beam Processing (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Claims (5)

  1. Körper, vereint aus unterschiedlichen Metallen, umfassend:
    eine erste Platte (102), die aus einem Kupfermaterial hergestellt ist;
    eine zweite Platte (101), die aus einem Aluminiummaterial hergestellt ist; und
    einen geschmolzenen gemischten Teil (105), der das Kupfermaterial enthält, in welches ein Teil des Aluminiummaterials eingeschmolzen ist,
    wobei der geschmolzene gemischte Teil (105) kontinuierlich und linear auf einer Fläche der ersten Platte (102) hergestellt wird, die aus Kupfermaterial hergestellt ist, welches die zweite Platte (101) kontaktiert, die aus Aluminiummaterial hergestellt ist,
    die Konzentration der Kupferkomponente im geschmolzenen gemischten Teil (105) ist kleiner als 10 %, und die Konzentration der Aluminiumkomponente in der Nähe des geschmolzenen gemischten Teils (105) in der ersten Platte (102), die aus Kupfermaterial hergestellt ist, beträgt weniger als 10 %,
    dadurch gekennzeichnet, dass
    der geschmolzene gemischte Teil (105) eine Tiefe (t) von der Oberfläche der ersten Platte (102) aus hat, die aus Kupfermaterial hergestellt ist, welches die zweite Platte (101) kontaktiert, die aus Aluminiummaterial hergestellt ist, die mindestens 5 µm und nicht mehr als 30 µm beträgt,
    und eine geringste Abmessung (W) des geschmolzenen gemischten Teils (105) beträgt mindestens 10 µm und nicht mehr als 50 µm auf der Oberfläche der ersten Platte (102), die aus Kupfermaterial hergestellt ist, welches die zweite Platte (101) kontaktiert, die aus Aluminiummaterial hergestellt ist.
  2. Körper, vereint aus unterschiedlichen Metallen, nach Anspruch 1, wobei die Dicke der ersten Platte (102), die aus Kupfermaterial hergestellt ist, mindestens 1 mm beträgt.
  3. Körper, vereint aus unterschiedlichen Metallen, nach Anspruch 1, wobei die Dicke der zweiten Platte (101), die aus Aluminiummaterial hergestellt ist, mindestens 0,5 mm und nicht mehr als 0,8 mm beträgt.
  4. Körper, vereint aus unterschiedlichen Metallen, nach Anspruch 1, wobei die erste Platte (102), die aus Kupfermaterial hergestellt ist, mit einer Nickelplattierung bedeckt ist.
  5. Körper, vereint aus unterschiedlichen Metallen, nach Anspruch 1, wobei der Körper, der aus unterschiedlichen Materialien vereint ist, als Anschlussverbindung in einem sekundär Akkumulator in einem Fahrzeug ausgelegt ist.
EP15780338.8A 2014-04-15 2015-04-07 Verbundener körper aus ungleichen metallen Active EP3132884B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2014083277 2014-04-15
JP2015028157A JP5982652B2 (ja) 2014-04-15 2015-02-17 異材金属接合体
PCT/JP2015/001939 WO2015159503A1 (ja) 2014-04-15 2015-04-07 異材金属接合体

Publications (3)

Publication Number Publication Date
EP3132884A1 EP3132884A1 (de) 2017-02-22
EP3132884A4 EP3132884A4 (de) 2017-03-08
EP3132884B1 true EP3132884B1 (de) 2019-12-11

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EP15780338.8A Active EP3132884B1 (de) 2014-04-15 2015-04-07 Verbundener körper aus ungleichen metallen

Country Status (4)

Country Link
US (1) US20160114429A1 (de)
EP (1) EP3132884B1 (de)
JP (1) JP5982652B2 (de)
WO (1) WO2015159503A1 (de)

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JP5982652B2 (ja) * 2014-04-15 2016-08-31 パナソニックＩｐマネジメント株式会社 異材金属接合体
CN205764438U (zh) * 2015-02-09 2016-12-07 司浦爱激光技术英国有限公司 激光焊缝和包括激光焊缝的物品
GB201502149D0 (en) * 2015-02-09 2015-03-25 Spi Lasers Uk Ltd Apparatus and method for laser welding
KR20230090371A (ko) * 2016-04-29 2023-06-21 누부루 인크. 반도체 패키징, 자동차 전기 장치, 배터리 및 기타 부품에 대한 가시 레이저 용접 방법
JP6681543B2 (ja) 2016-07-21 2020-04-15 パナソニックＩｐマネジメント株式会社 溶接金属部材とその溶接金属部材を有する電池
US20200141434A1 (en) * 2017-07-25 2020-05-07 Sumitomo Electric Industries, Ltd. Method of manufacturing metal member-welded structure, and metal member-welded structure
JP7058955B2 (ja) 2017-07-28 2022-04-25 日本発條株式会社 溶接部を有するワークと、ワークのための溶接装置と、溶接方法
KR102299768B1 (ko) 2017-09-11 2021-09-07 주식회사 엘지화학 금속간 화합물 분석을 통하여 용접 조건 최적화하는 이종 금속간 레이저 용접 방법
JP6587072B2 (ja) * 2017-10-30 2019-10-09 パナソニックＩｐマネジメント株式会社 金属部材の溶接構造および溶接方法
CN112638571B (zh) * 2018-09-03 2022-11-08 住友电气工业株式会社 金属部件的焊接结构以及金属部件的焊接结构的制造方法
CN110936013B (zh) * 2018-09-21 2021-12-10 大族激光科技产业集团股份有限公司 一种可伐合金与异种金属的封接方法及封接体
JP7110907B2 (ja) 2018-10-26 2022-08-02 トヨタ自動車株式会社 異種金属部材の重ね溶接方法
CN110000471A (zh) * 2019-02-26 2019-07-12 武汉力神动力电池系统科技有限公司 一种激光焊接方法
CN110253146B (zh) * 2019-07-03 2021-08-27 湖南科技大学 一种高强度铜铝异种材料双螺旋焊接工艺
CN110340521A (zh) * 2019-07-19 2019-10-18 中国第一汽车股份有限公司 一种铜和镍的激光焊接方法
US12603393B2 (en) 2019-11-20 2026-04-14 Sk On Co., Ltd. Battery module
CN111037099B (zh) * 2019-12-31 2021-04-09 广东省科学院中乌焊接研究所 一种不等厚度铜及其合金板端面的激光焊接方法和系统
KR102819127B1 (ko) * 2020-03-31 2025-06-12 주식회사 엘지에너지솔루션 이종금속으로 이루어진 hv 버스 바 및 이의 제조 방법
KR102895044B1 (ko) 2020-04-13 2025-12-02 주식회사 엘지에너지솔루션 전지 모듈 및 그 제조 방법
CN111682155A (zh) * 2020-06-19 2020-09-18 珠海冠宇电池股份有限公司 电池及可移动用电设备
CN111682156B (zh) * 2020-06-19 2023-06-30 珠海冠宇电池股份有限公司 电池及其制备方法以及电子产品
WO2022009996A1 (ja) * 2020-07-10 2022-01-13 古河電気工業株式会社 溶接方法、溶接装置、および金属部材の溶接構造
JP7583761B2 (ja) 2022-04-25 2024-11-14 プライムプラネットエナジー＆ソリューションズ株式会社 バスバー及びそれを備えた組電池
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Also Published As

Publication number Publication date
EP3132884A1 (de) 2017-02-22
EP3132884A4 (de) 2017-03-08
WO2015159503A1 (ja) 2015-10-22
JP2015211981A (ja) 2015-11-26
US20160114429A1 (en) 2016-04-28
JP5982652B2 (ja) 2016-08-31

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